Articles | Volume 16, issue 2
https://doi.org/10.5194/cp-16-487-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-16-487-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
10 Mar 2020
Research article |
| 10 Mar 2020
| 10 Mar 2020
Multiproxy evidence of the Neoglacial expansion of Atlantic Water to eastern Svalbard
Institute of Oceanology, Polish Academy of Sciences, Sopot, 81-712,
Poland
Magdalena Łącka
Institute of Oceanology, Polish Academy of Sciences, Sopot, 81-712,
Poland
Małgorzata Kucharska
Institute of Oceanology, Polish Academy of Sciences, Sopot, 81-712,
Poland
Jan Pawlowski
Institute of Oceanology, Polish Academy of Sciences, Sopot, 81-712,
Poland
Department of Genetics and Evolution, University of Geneva, Geneva, CH
1211, Switzerland
Marek Zajączkowski
Institute of Oceanology, Polish Academy of Sciences, Sopot, 81-712,
Poland
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This study addresses the gap by reconstructing the history of marine eukaryotic communities using sedaDNA metabarcoding analysis from Storfjordrenna, and the eukaryotic biodiversity remained relatively stable, with a notable exception during the transitions between major climatic intervals. Cercozoans and MAST emerged as dominant groups, highlighting their ecological flexibility and broad tolerance. Our findings highlight the potential of sedaDNA for reconstructing past eukaryotic communities.
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The presented study focuses on the last millennium of the palaeoclimatic history of Svalbard region. The investigation was based on classical palaeoceanographic proxies, strengthened by the analysis of ancient foraminiferal DNA in down-core sediment samples. This study is the first attempt to implement the aDNA record in the palaeoenvironmental reconstruction. The aDNA data revealed even small environmetal changes that were not evidenced in the sedimentological and micropalaeontological record.
Hasitha Nethupul, Magdalena Łącka, Marek Zajączkowski, Dhanushka Devendra, Ngoc-Loi Nguyen, Jan Pawłowski, and Joanna Pawłowska
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This study addresses the gap by reconstructing the history of marine eukaryotic communities using sedaDNA metabarcoding analysis from Storfjordrenna, and the eukaryotic biodiversity remained relatively stable, with a notable exception during the transitions between major climatic intervals. Cercozoans and MAST emerged as dominant groups, highlighting their ecological flexibility and broad tolerance. Our findings highlight the potential of sedaDNA for reconstructing past eukaryotic communities.
Ewa Demianiuk, Mateusz Baca, Danijela Popović, Inès Barrenechea Angeles, Ngoc-Loi Nguyen, Jan Pawlowski, John B. Anderson, and Wojciech Majewski
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Ancient foraminiferal DNA is studied in five Antarctic cores with sediments up to 25 kyr old. We use a standard and a new, more effective marker, which may become the next standard for paleoenvironmental studies. Much less diverse foraminifera occur on slopes of submarine moraines than in open-marine settings. Soft-walled foraminifera, not found in the fossil record, are especially abundant. There is no foraminiferal DNA in tills, suggesting its destruction during glacial redeposition.
Andrea Habura, Stephen P. Alexander, Steven D. Hanes, Andrew J. Gooday, Jan Pawlowski, and Samuel S. Bowser
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Manuscript not accepted for further review
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Our findings document four sediment-laden meltwater pulses between 14.7 and 8.2 kyr BP. These pulses, primarily driven by deglacial processes and supplemented by paleo-lake outbursts or paleo-tsunami currents, are marked by drops in sea surface temperatures, increased sea ice content, high terrigenous supply, and a limited influence of AW. One of the key highlights of our study is the evidence of the Storegga tsunami impact around 8.2 kyr BP, likely redistributed sediments in the NW Barents Sea.
Raphaël Morard, Franck Lejzerowicz, Kate F. Darling, Béatrice Lecroq-Bennet, Mikkel Winther Pedersen, Ludovic Orlando, Jan Pawlowski, Stefan Mulitza, Colomban de Vargas, and Michal Kucera
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The exploitation of deep-sea sedimentary archive relies on the recovery of mineralized skeletons of pelagic organisms. Planktonic groups leaving preserved remains represent only a fraction of the total marine diversity. Environmental DNA left by non-fossil organisms is a promising source of information for paleo-reconstructions. Here we show how planktonic-derived environmental DNA preserves ecological structure of planktonic communities. We use planktonic foraminifera as a case study.
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Clim. Past, 12, 1459–1472, https://doi.org/10.5194/cp-12-1459-2016, https://doi.org/10.5194/cp-12-1459-2016, 2016
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Related subject area
Subject: Ocean Dynamics | Archive: Marine Archives | Timescale: Holocene
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Is there evidence for a 4.2 ka BP event in the northern North Atlantic region?
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Atlantic Water advection vs. glacier dynamics in northern Spitsbergen since early deglaciation
Holocene dynamics in the Bering Strait inflow to the Arctic and the Beaufort Gyre circulation based on sedimentary records from the Chukchi Sea
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Lauren T. Toth and Richard B. Aronson
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We explore the hypothesis that a shift in global climate 4200 years ago (the 4.2 ka event) was related to the El Niño–Southern Oscillation (ENSO). We summarize records of coral reef development in the tropical eastern Pacific, where intensification of ENSO stalled reef growth for 2500 years starting around 4.2 ka. Because corals are highly sensitive to climatic changes, like ENSO, we suggest that records from coral reefs may provide important clues about the role of ENSO in the 4.2 ka event.
Alena Giesche, Michael Staubwasser, Cameron A. Petrie, and David A. Hodell
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Masanobu Yamamoto, Seung-Il Nam, Leonid Polyak, Daisuke Kobayashi, Kenta Suzuki, Tomohisa Irino, and Koji Shimada
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Based on mineral records from the northern Chukchi Sea, we report a long-term decline in the Beaufort Gyre (BG) strength during the Holocene, consistent with a decrease in summer insolation. Multi-centennial variability in BG circulation is consistent with fluctuations in solar irradiance. The Bering Strait inflow shows intensification during the middle Holocene, associated with sea-ice retreat and an increase in marine production in the Chukchi Sea, which is attributed to a weaker Aleutian Low.
Martin Jakobsson, Christof Pearce, Thomas M. Cronin, Jan Backman, Leif G. Anderson, Natalia Barrientos, Göran Björk, Helen Coxall, Agatha de Boer, Larry A. Mayer, Carl-Magnus Mörth, Johan Nilsson, Jayne E. Rattray, Christian Stranne, Igor Semiletov, and Matt O'Regan
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The Arctic and Pacific oceans are connected by the presently ~53 m deep Bering Strait. During the last glacial period when the sea level was lower than today, the Bering Strait was exposed. Humans and animals could then migrate between Asia and North America across the formed land bridge. From analyses of sediment cores and geophysical mapping data from Herald Canyon north of the Bering Strait, we show that the land bridge was flooded about 11 000 years ago.
Annette Hahn, Enno Schefuß, Sergio Andò, Hayley C. Cawthra, Peter Frenzel, Martin Kugel, Stephanie Meschner, Gesine Mollenhauer, and Matthias Zabel
Clim. Past, 13, 649–665, https://doi.org/10.5194/cp-13-649-2017, https://doi.org/10.5194/cp-13-649-2017, 2017
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Our study demonstrates that a source to sink analysis in the Gouritz catchment can be used to obtain valuable paleoclimatic information form the year-round rainfall zone. In combination with SST reconstructions these data are a valuable contribution to the discussion of Southern Hemisphere palaeoenvironments and climate variability (in particular atmosphere–ocean circulation and hydroclimate change) in the South African Holocene.
Janne Repschläger, Dieter Garbe-Schönberg, Mara Weinelt, and Ralph Schneider
Clim. Past, 13, 333–344, https://doi.org/10.5194/cp-13-333-2017, https://doi.org/10.5194/cp-13-333-2017, 2017
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We reconstruct changes in the warm water transport from the subtropical to the subpolar North Atlantic over the last 10 000 years. We use stable isotope and Mg / Ca ratios measured on surface and subsurface dwelling foraminifera. Results indicate an overall stable warm water transport at surface. The northward transport at subsurface evolves stepwise and stabilizes at 7 ka BP on the modern mode. These ocean transport changes seem to be controlled by the meltwater inflow into the North Atlantic.
Yannick Mary, Frédérique Eynaud, Christophe Colin, Linda Rossignol, Sandra Brocheray, Meryem Mojtahid, Jennifer Garcia, Marion Peral, Hélène Howa, Sébastien Zaragosi, and Michel Cremer
Clim. Past, 13, 201–216, https://doi.org/10.5194/cp-13-201-2017, https://doi.org/10.5194/cp-13-201-2017, 2017
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In the boreal Atlantic, the subpolar and subtropical gyres (SPG and STG respectively) are key elements of the Atlantic Meridional Overturning Circulation (AMOC) cell and contribute to climate modulations over Europe. Here we document the last 10 kyr evolution of sea-surface temperatures over the North Atlantic with a focus on new data obtained from an exceptional sedimentary archive retrieved the southern Bay of Biscay, enabling the study of Holocene archives at (infra)centennial scales.
Quentin Dubois-Dauphin, Paolo Montagna, Giuseppe Siani, Eric Douville, Claudia Wienberg, Dierk Hebbeln, Zhifei Liu, Nejib Kallel, Arnaud Dapoigny, Marie Revel, Edwige Pons-Branchu, Marco Taviani, and Christophe Colin
Clim. Past, 13, 17–37, https://doi.org/10.5194/cp-13-17-2017, https://doi.org/10.5194/cp-13-17-2017, 2017
Mercè Cisneros, Isabel Cacho, Jaime Frigola, Miquel Canals, Pere Masqué, Belen Martrat, Marta Casado, Joan O. Grimalt, Leopoldo D. Pena, Giulia Margaritelli, and Fabrizio Lirer
Clim. Past, 12, 849–869, https://doi.org/10.5194/cp-12-849-2016, https://doi.org/10.5194/cp-12-849-2016, 2016
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We present a high-resolution multi-proxy study about the evolution of sea surface conditions along the last 2700 yr in the north-western Mediterranean Sea based on five sediment records from two different sites north of Minorca. The novelty of the results and the followed approach, constructing stack records from the studied proxies to preserve the most robust patterns, provides a special value to the study. This complex period appears to have significant regional changes in the climatic signal.
C. Consolaro, T. L. Rasmussen, G. Panieri, J. Mienert, S. Bünz, and K. Sztybor
Clim. Past, 11, 669–685, https://doi.org/10.5194/cp-11-669-2015, https://doi.org/10.5194/cp-11-669-2015, 2015
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A sediment core collected from a pockmark field on the Vestnesa Ridge (~80N) in the Fram Strait is presented. Our results show an undisturbed sedimentary record for the last 14 ka BP and negative carbon isotope excursions (CIEs) during the Bølling-Allerød interstadials and during the early Holocene. Both CIEs relate to periods of ocean warming, sea-level rise and increased concentrations of methane (CH4) in the atmosphere, suggesting an apparent correlation with warm climatic events.
M. Łącka, M. Zajączkowski, M. Forwick, and W. Szczuciński
Clim. Past, 11, 587–603, https://doi.org/10.5194/cp-11-587-2015, https://doi.org/10.5194/cp-11-587-2015, 2015
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Storfjordrenna was deglaciated about 13,950 cal yr BP. During the transition from the sub-glacial to glaciomarine setting, Arctic Waters dominated its hydrography. However, the waters were not uniformly cold and experienced several warmer spells. Atlantic Water began to flow onto the shelves off Svalbard and into Storfjorden during the early Holocene, leading to progressive warming and significant glacial melting. A surface-water cooling and freshening occurred in late Holocene.
I. Hessler, S. P. Harrison, M. Kucera, C. Waelbroeck, M.-T. Chen, C. Anderson, A. de Vernal, B. Fréchette, A. Cloke-Hayes, G. Leduc, and L. Londeix
Clim. Past, 10, 2237–2252, https://doi.org/10.5194/cp-10-2237-2014, https://doi.org/10.5194/cp-10-2237-2014, 2014
A. D. Tegzes, E. Jansen, and R. J. Telford
Clim. Past, 10, 1887–1904, https://doi.org/10.5194/cp-10-1887-2014, https://doi.org/10.5194/cp-10-1887-2014, 2014
D. E. Groot, S. Aagaard-Sørensen, and K. Husum
Clim. Past, 10, 51–62, https://doi.org/10.5194/cp-10-51-2014, https://doi.org/10.5194/cp-10-51-2014, 2014
C. V. Dylmer, J. Giraudeau, F. Eynaud, K. Husum, and A. De Vernal
Clim. Past, 9, 1505–1518, https://doi.org/10.5194/cp-9-1505-2013, https://doi.org/10.5194/cp-9-1505-2013, 2013
C. Giry, T. Felis, M. Kölling, W. Wei, G. Lohmann, and S. Scheffers
Clim. Past, 9, 841–858, https://doi.org/10.5194/cp-9-841-2013, https://doi.org/10.5194/cp-9-841-2013, 2013
G. Siani, M. Magny, M. Paterne, M. Debret, and M. Fontugne
Clim. Past, 9, 499–515, https://doi.org/10.5194/cp-9-499-2013, https://doi.org/10.5194/cp-9-499-2013, 2013
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Short summary
Paleoceanographic changes in Storfjorden during the Neoglacial (the last
4000 years) were reconstructed based on microfossil and ancient DNA records. Environmental changes were steered mainly by the interaction between the inflow of Atlantic Water (AW) and sea ice cover. Warming periods were associated with AW inflow and sea ice melting, stimulating primary production. The cold phases were characterized by densely packed sea ice, resulting in limited productivity.
Paleoceanographic changes in Storfjorden during the Neoglacial (the last
4000 years) were...
